GB/T 23341.2-2018Turbochargers—Part 2: Test methods (English PDF)

3.1 Hot blast test

The test that the external source compressed air is heated and input to the turbine, and the supercharger is driven by the thermal expansion of the high-temperature gas.

3.3 Compressor surge flow

The speed of the supercharger is constant. When the flow rate of the compressor decreases to a certain value, the outlet pressure and speed of the compressor will fluctuate violently. Compressor surge flow refers to the corresponding flow value at this time.

3.4 Compressor choke flow

The speed of the supercharger is constant. With the reduction of the compressor pressure ratio, the flow of the compressor does not increase any more. Compressor choke flow refers to the corresponding flow value at this time.

4.1 Test bench pipeline

4.2 Measurement of rotate speed

The rotate speed of the supercharger shall be measured by a method that does not disturb the flow, such as the non-contact electromagnetic sensor tube speed measurement or photoelectric speed measurement instrument for the magnetization of the compressor impeller lock nut. Instrument accuracy is ±0.2% of full scale.

4.3 Pressure measurement

4.3.3 Ambient barometric pressure measurement. Instrument accuracy is ±2% of full scale.

4.4 Temperature measurement

4.4.1 Compressor and turbine inlet and outlet temperatures shall be measured in circular section measuring tubes by electrical thermometers with stagnant sheaths. The measuring point shall be arranged at a position of 0.5 times the pipe diameter behind the static pressure measuring point (in the direction of the airflow). It shall be staggered from the pressure measuring point.

4.4.2 When measuring the performance of the compressor, the accuracy of the instrument is ±0.3% of the full scale. When measuring turbine performance, the instrument accuracy is ±0.5% of full scale. For other measurement of turbine inlet and outlet temperature, the instrument accuracy is ±1% of full scale.

4.4.3 Lubricating oil temperature measurement. Instrument accuracy is ±2% of full scale.

4.5 Flow measurement

Compressor flow measurement can be carried out by gas mass flowmeter or standard orifice flowmeter or end-face intake double-wire flowmeter.

6.1 Compressor performance test

6.1.1 Test conditions

The performance test of the compressor shall be carried out on a special bench that can adjust the working conditions and measurable parameters. The test bench and test conditions shall comply with the provisions of Chapter 4 and Chapter 5.

6.1.2 Test methods

6.1.2.3 During the test, each equal-conversion speed line is measured point by point from surge flow to choke flow. Between the surge flow and the choke flow, the measurement points shall be no less than 6 points, evenly distributed. When the compressor runs close to the surge area, the total pressure fluctuation range of the compressor outlet is more than 10%. At this time, the supercharger is accompanied by a regular abnormal noise. Compressor air flow shall be adjusted slowly. Control the total pressure fluctuation of the compressor outlet within 2%. Measure the compressor surge flow point.

6.1.3 Test steps

Carry out the test according to the following test steps. […]

6.1.4 Measurement parameters

During the test, measure the following parameters.

6.1.5 Data processing

According to the parameters measured in the test, according to the relevant formulas in GB/T 23341.1-2018, calculate compressor conversion flow, compressor efficiency, compressor pressure ratio.

6.2 Turbine performance test

6.2.1 Test conditions

The test shall be carried out on a special bench that can adjust the working conditions and measurable parameters. The test bench and test conditions shall comply with the provisions of Chapter 4 and Chapter 5.

6.2.2 Test methods

6.2.3 Test steps

Carry out the test according to the following test steps.

6.2.4 Measurement parameters

During the test, measure the following parameters.

6.2.5 Data processing

According to the parameters measured in the test, according to the relevant formulas in GB/T 23341.1-2018, calculate turbine resemble flow, turbine efficiency, expansion ratio. Take the expansion ratio piT as the abscissa.

6.3.5 Data processing

According to the parameters measured in the test, according to the relevant formulas in GB/T 23341.1-2018, calculate supercharger performance parameters such as compressor pressure ratio pic, compressor conversion flow Gcnp, compressor efficiency etac and supercharger total efficiency etaTc. The self cycle performance test data can be recorded in the format of Annex C.

6.4 Supercharger noise test

According to JB/T 12334-2015.

6.5 Characteristic test of turbocharger lubricating oil supply

6.5.1 Test conditions

The test bench shall comply with the provisions of Chapter 4. In addition to the provisions in Chapter 5, the test conditions shall also meet the following provisions.

6.5.3 Test steps

Carry out the test according to the following test steps.

6.5.4 Measurement parameters

During the test, measure the following parameters.

6.6 Casing containment test of supercharger

6.6.1 Test conditions

The test shall be carried out on a special bench that can adjust the working conditions and measurable parameters. In addition to the test bench and test conditions shall meet the provisions of Chapter 4 and Chapter 5, the test bench shall also be equipped with safety protection devices and video recording system.

6.8.3 Test steps

Carry out the 200h reliability endurance thermal cycle assessment test of the supercharger according to the following test steps.

6.8.4 Measurement parameters

During the test, make a check and measurement record every 1h during the calibration parameter operation test. The lubricating oil flow is measured and recorded every 10h.

The thermal cycle operation test is measured and recorded every 1h. Measure the following parameters.

6.9 Turbine casing flow capacity test

6.9.1 Test conditions

The test shall be carried out on a special bench for the turbine casing flow capacity test that can adjust the working conditions and measurable parameters. The test bench shall be debugged. The instruments and meters are calibrated accurately. The operation test is reliable.

6.9.3 Test steps

Carry out the test according to the following test steps.

6.10 Determination of supercharger cleanliness

According to chapter 4 of JB/T 6002-2007, determine the cleanliness of the supercharger.

6.11 Dynamic balance test of supercharger

Test according to JB/T 9752.3.

6.12 Tightness test of supercharger

Carry out the sealing test of the supercharger according to Chapter 5 of JB/T 12335-2015. […]